Polyazo-dyestuffs



United States Patent :POLYAZO-DYESTUFFS Claims priority,-application fGermanyJuly 2, 1352 7 -'Claims. (Cl. 260-144) The present invention relates to new polyazo-dyestufis; more particularly it relates to the polyazo-dyestufis corresponding to the following general formula ice .2 is eapableiof coupling twice, it ispossible to :obtainvaluable higher polyazo-dyestufis by combining the said polyazo-dyestutfs with "a further diazoor 'diazoazo-compound which may contain one or more .sulfonic acid groups.

"The invention also includes an alternative process 'for making polyazo-dyestuifs of the above constitution, wherein 1 molecular proportion of the tetrazotized diaminocompound is coupled in an acid medium with 1 molecular proportion'of'a l amino 8=hydroxynaphthalene=monoo'r disulfonic acid, the diaZoaZo-compound so obtained is combined with 1 molecular proportion of a diazotized amine and the resulting diazopolyazo-compound iscoupledxin an alkaline medium with 1 molecular proportion of .the azo-dyestuff .from 3.3'-dihydroxydiphenylamine and-a sulfonateddiazoor diazoazo-compound.

"The invention also includes a further process for making the aforesaid polyazo-dyestufls, wherein lmdlecular where Ryand' R 'represent aromatictradieals, standsifor the diphenyl bond, --CH=CH, NH-CO'NH--, -'-CO--, --O--, -S, --NH-- or --=CONH, represents hydrogen or the sulfon'ic acid group eand wherein the phenyl radicals a may contain substituents.

This application is a divisional 1 application tof application'Serial No. 364,910, filedsJune 29, 1953.

We have found that new valuable polyazo dy'estuffsscorresponding to the general constitution 1-amlno-8-hydroxy acid amino 0 naphthalene-mono- 0--- or dlsulfonic acid NH: /X 3.3'-dlhydroxydi- (8mm phenylamlne are obtained by coupling 1 molecular proportion "of a tetrazotized diamine of the general .formula proportion of the tetrazotized 'diamino-compound iis conpled in an :acid medium with 1 molecular proportion of a .l amino 8ehydroxynaphthalene monoor :disulfonic acid, vthe diazoazo-compound so obtained is combined in anralkaline medium with 1 molecular PIOPOItlOHlOf the azo-dyestuff from 3.3-dihydroxydiphenylamine :and a sulfonated diazo- "or diazoazo-compound, and :the result-- ing polyazo-:dyestufl? is coupled with .1 molecular 'propor-- tionofra "diazotized amine.

.The invention .also includes another process -for making :the aforesaid polyazo-dyestuffs, wherein 1 .molecular proportion of the tetrazotized diamino-vcompound is coupled in an acid medium with 1 molecular proportion of a 1-amino-8-hydroxynaphthalene-monoor disulfonic acid, the diazoazo-compound so obtained is combined with 1 molecular proportion of 3.3-dihydroXy-dipheny1- amine, and the resulting disazo-dyestuff is coupled with -2 molecular proportions of .the .same or dilferent diazoor diazoazo-compound.

The invention also includes another process'for making the aforesaid polyazo-dyestuffs, wherein 1 molecular proportion of the tetrazotiz'ed diamino-compound is coupled with 1 molecular proportion of a 1-amino-8-hydroxynaphthalene-monoor disulfonic acid, the diazoazo-com- Pound so obtained is combined with 1 molecular proportion of adiazotizediamine, and the. resulting diaz'o p'dlyazocompound and 1 molecular proportion of a diazo- "or diazoazo-compound are coupled simultaneously with ,1

molecular proportion of 3.3-dihydroXydiphenylamineL The new dyestuffs are readily soluble in water and are resistant to inorganic and organic acids as well as to alkalies and formaldehyde. They have a great aflinity for leather fibers, and dye the various kinds of leather, by drum :dyeing, brush dyeing or vspray dyeing, deep full tints which varyrfrom violet, dark green over dark blue to black.

3, In German Patent 566,471 is described a dyestufi of the following constitution acid aniline --o l-amlno-S-h 4.4'-dia-hydroxydroxynapht, aamlnodi- 2-methyllene-3.6-disu1- phenyl diphenylionle acid amine This product, however, cannot be used for dyeing leather on account of its insufficient solubility and its great sensi tiveness to, acids. Though it is possible to improve the solubility by introducing further sulfonic acid groups into the dyestufi molecule as described in German Patent 582,399, these dyestuffs are precipitated on addition of dilute sulfuric acid. The same applies to the dyestuif described in British Patent 604,831 and having the followparts of calcium carbonate. To the diazoazo-compound so obtained a diazo-suspension prepared from 17.3 parts of 1-aminobenzene-4-sulfonic acid is added in one portion and 36 parts of anhydrous sodium carbonate are then introduced. After 30 minutes a weakly alkaline solution of 20.1 parts of 3.3f-dihydroxydiphenylamine is added and the coupling is conducted at a pH-value of 10 in the presence of 50 parts by volume of a 2 N-solution of sodium hydroxide. The trisazo-dyestufi so obtained is stirred overnight. An aqueous diazo-suspension from 17.3 parts of 1-aminobenzene-4-sulfonic acid is then slowly added, while cooling, and the pH-value of the coupling 1 medium is maintained at 10 by the addition of a 2 N- mg constitution:

- acid suliauilic r l-amino-S-hy- 4- 4.4'-di- 0 l-amino-Iiacid droxy-naphthaaminodlhydroxylene-3.6-disul phenyi benzene ionic acid The new dyestufls obtainable by using 3.3'-dihydroxydiphenylamine are superior to the known dyestuffs mentioned above generally with respect to their resistance to 1' acids. They yield fuller surface dyeings and have much better penetrating and through-dyeing properties than the dyestuif described in British Patent 618,007.

The following examples serve to illustrate the invention but they are not intended to limit it thereto; the parts being by weight unless otherwise stated, and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter:

Example 1 18.4 parts of 4.4-diaminodiphenyl are tetrazotized in the usual manner and the tetrazo solution is combined in an acid medium with 34.1 parts of 1-amino-8-hydroxy- J.naphthalene-3.6-disulfonic acid (monosodium salt), the

excess of the acid being neutralized with 3.5 parts of A tetrazo-solution prepared in the usual manner from 18.4 parts of 4.4'-diaminodiphenyl is combined in'an acid medium within 16 hours with 34.1 parts of 1-amino-8- hydroxy-naphthalene-3.6-disulfonic acid (monosodium salt), the excess of the acid being removed by the addition of 3.5 parts of calcium carbonate. To the diazoazocompound so obtained a dia'zo-suspension prepared from 17.3 parts of 1-aminobenzene-4-sulfonic acid is added in one portion and 36 parts of anhydrous sodium carbonate are then introduced. After minutes, a weakly alkaline solution of 20.1 parts of 3.3-dihydroxy-diphenylamine is poured in and the coupling is conducted at a pH-value of 10.by adding 50 parts by volume of a 2 N-solution of sodium hydroxide. After stirring for 4 hours, the mixcalcium carbonate. When the coupling is complete, a

diazo-suspension prepared from 17.3 parts of l-amino-i.

benzene-4-sulfonic acid is added in one portion and 150 """parts byvolume of a 2 N-solution of sodium hydroxide are then introduced to obtain a pH-value of 10. After stirring for 30 minutes, a solution of 10 parts of 3.3- dihydroxy-diphenylamine in 100 parts by volume of water and 10 parts by volume of a 10 N-solution of sodium hydroxide is then added, the pH-value of the coupling med-- ium being maintained. The mixture is stirred overnight, rendered acid to Congo paper and filtered ofi with suction.

The hexakisazo-dyestuff obtained in the form of a black ture is rendered acid with 100 parts by volume of 2 N' acetic acid, salted out with sodium chloride, filtered off with suction and dried. The trisazo-dye'stuff so obtained corresponds to the following formula:

18.4 parts of 4.4 '-diaminodiphenyl is combined in an acid medium within 16 hours with 34.1. parts of 1-amino-8- hydroxy-naphthalene-3.6-disulfonic acid (monosodium powder dyes the various kinds of leather deep black? tints with a distinctly blue hue which are distinguished by a good fastness to acids, alkalies and formaldehyde. and a full covering power.

Example 4 184 parts of 4.4'-diamino-diphenyl are tetrazotized in 50 the usual manner and the tetrazo-solution is coupled at 3.6'-disi1lfonic acid,"the excess of the acid being neutralized with 35 partsof calcium carbonate. To the diazoazo-,

' compound so. obtained a diazo-suspension prepared from.

A tetrazo-solution prepared in the usual manner from 173 parts of, 1-aminobenzene-4-sulfonic acid is added at- 5 C.,v and 2000 parts by volume of a 2 N-solution of. sodium hydroxide are then introduced so that the cou-;

, pling is completed ata pH-value of 10. The resulting diazodisazo-compound is combined, while maintaining the pH-value of 1,0, with the monoazo-dyestuff obtained by.-

salt), the excess of the acid being neutralized with 3.5 coupling in an alkaline medium 201 parts of 3.3'-dihygazet eer dror iph n m n it the di usren n p e r d from .173 parts of l-aminobenzene-4 -sulfonic acid. When the coupling is complete, the tetrakis'a'zo-dyestuif is acidified with 250 parts by volume of 5 .N-hydrochloric acid, the mixture is heated to 90 C., precipitated with sodium chloride, filtered ofi with suction and dried. The resulting dyestu'if corresponds with respect toits dyeing and fastness properties withthe dyestufi described in' Example 2.

Example 5 The diazoazo-compound' obtainable as described in EX- ample 4 from tetrazotized 4.4 '-diamino-diphenyl and 1- amino-8-hydroxynaphthalene6.6-disulfonic acid is combined cat a pH-yalue-of I-O'With themonoazo-dyestufi preparedfrom thediazo-suspension of 173 parts of l-aminobenzene-#sulfonic acid-.and;,201 parts of 3.3 '-dihydroxydiphenylamine. The trisazo-dyestufr so obtained is coupled, while maintaining the pH-value-of 10, with a diazosuspension prepared from 17 3 parts of l-amino-benzene- 4-sulfonic acid and the product is isolated as described in the-foregoing examples. The tetrakisazo-dycstufl dyes the various kinds of leather covered reddish-black tints of good fastnessproperties.

Example 6 To the diazoazo-compound from tetrazotized 4.4'-diamino diphenyl and 1'-amino-8-hydroxynaphthalene-3.6- disulfonicacid obtainable as described 'in Examples 1 and 2 a solution of 20.1 :parts of 3,3'-dihydroxy-diphenylamine in 20 parts by volume of a--10 N-solution of sodium hydroxideandZOO partsby volume of water is added and a sufiicient quantity of a ION-solutionof sodium hydroxide is then introduced so that-the-coupling occurs-at a pH- value of 10. The disaz'o-dyestulf so'obtained-is combined, while cooling, with the diazo1suspension-prepared from 34.6 partsof l -aminobenzenet-sulfonic acid and 200 parts by volume of a 2- N-s'olution of sodium hydroxide are added simultaneously-so that the couplingmedium is maintained at a pH value of 10. The dyestuff is stirred overnight, then rendered acid, heated to 90 C., precipitated with a small quantity of sodium chloride,fi1tered oil with suction and dried. The black powder so'obtained is readily soluble in water and .dyes-the various kinds of leather, by drum dyeing, brush-dyeing or spray dyeing, deepblack tints of good covering power, verygood fastmess to light and very goodgen'eral fastness-properties.

hydroxymaphthalene-j.6 disulfonic' .acid- .(monosodium salt-)J, the'excess of the acid being1neutra1ized'wlth }3;5: parts of calcium carbonate. Io .theIdiazoazo-compound so obtained a diam-suspension .from 17.3 parts of 31- amiriobenzenel-sulfonic acid is added in one portion, and136 parts of anhydrous sodium carbonate are then-in troduced. After minutes, an alkaline solution .ofj20.l parts of ,3.3 dihydroxy-diphenylamine and a .suflici'ent quantity era 2 ,N-solu'tion of sodium hydroxideare .intro-' ducetl so that the coupling occurs-in a strongly alkalinei medium. The trisazo-dyestufiis stirred overnight. While cooling, a diazo-suspension prepared from 17.3 parts of 1-aminobenzene-4-sulfonic' acid is slowly added and simultaneously such ,a-quantity of a 2 rN-solution .ofsodiurn hydroxide that the alkaline reactioniof the coupling medium is maintained. After stirring for Shouts, the tetrakisazo-dyestuif is isolated in the usual manner. The grey-black powder so obtained is readily soluble in waterand dyes all kinds of leather by various methods of dyeing deep full black tints having a good covering power, fastness to light and resistance to inorganic and organic acids" as well as'to formaldehyde andalkalies.

Example .8

acid l-amino-S-hydroxynaphtha1ene-3.fi-dlsulionlc acid -nis combined 'inan alkaline medium with 0.l molecular p'roportion of the ,dia'zodisazo-compouud of the following 35 formula 110' NH, .Hid on.

The dyestufi'esolution,neutralized with acetic acid is heated to 90 C., rendered acid to Congo paper and precipitated bluish blacktints of remarkably good fastness properties.

Example '9 0.1 molecular proportionoftthe diazo-disazo-compound of the following formula Example '17 A tetrazo-solution prepared in the usual manner from T 21 parts ofElW-diaminostilbene"is combined in an acid is combined in an alkaline medium with 0.1 molecular proportion of the trisazo-dyestulf obtainable by coupling in an acid medium the diazo-su'spension prepared from 17.3 parts of 1-aminobenzene-4-sulfonic acid with 34.1 ,rrnedium within 16 hours with 34.1 partsrof lramino-8- 5 parts of l-amino-8rhydroxynaphthalenee3,6-disulfonic asaasai Example 10 The alkaline solution of the diazo-disazo-compound which is obtained asdescribed in Example 4 and has the following constitution alkaline l-lminobanzena-ksulionic acid m 1-aminc-8-hydroxynaphthalene-3.6-disulionic acid 4- 4.4'-diaminodiphenyl is stirred for 36 hour and then adjusted to a pH-value of 4 by adding the appropriate quantity of a 5 N-solution of hydrochloric acid. After the addition of 60 parts of glacial acetic acid, a solution rendered alkaline with sodium hydroxide of 201 parts of 3.3-dihydroxy-diphenylamine and 60 parts of glacial acetic acid are added simultaneously drop by drop in the course of 2 hours. Under the buffer action of the sodium acetate which is formed, the coupling to form the trisazo-dyestufi takes place at a pH-value of 4. When the coupling is complete, the trisazo-dyestufi is combined in an alkaline medium with the diazo suspension prepared from 173 parts of l-aminobenzen'e 4-sulfonic acid to form the tetrakisazo-dyestuif which is isolated in the usual manner. The grey-black powder so obtained is readily soluble in water and dyes the various kinds of leather deep black tints having a good fastness to light and resistance to inorganic and organic acids as well as to alkalies and formaldehyde.

- Example 11 The diazo-disazo-compound obtainable as described in Example 4 and having the constitution alkaline 1-aminobenzene-4-sulionlc acid m 80 1-amino-8-hydroxynaphthaiene-3.6-diaulfonic acid 4-- 4.4'-dia1nino-dipheuyl is mixed, while well stirring, with the diazo-suspension prepared from 173 parts of 1-aminobenzene-4-sulfonic acid. Into the mixture so obtained an alkaline solution of 201 parts of 3.3'-dihydroxy-diphenylamine and 100 parts by volume of a N-solution of sodium hydroxide are introduced so that the coupling takes place in a strongly alkaline medium. When the coupling is complete, the tetrakisazo-dyestufi is isolated in the usual manner, filtered oif with suction and dried. It dyes the various kinds of leather deep covered black tints of good fastness properties.

In the following table are given a number of further polyazo-dyestuifs of this invention which dye leather similar tints having the same good fastness properties:

Constitution Tint 1. 1 amino 4 acetaminobenzene 2 sulionic acid blue-black.

1 aminoki 8 hydroxynaphthalena 3.6 disuitonic acid o-- 4.4 diamino -diphcnyl v 3.3 dihydroxy diphenylamine. 3. 1 amino 2 methyl 3 chiorobanzene 5 sulfonic acid -v 1namigo-8-hydroxynaphthalener3.6-

anllonic acid 4.4+ diamino diphenyl 8.3-dihydroxy-diphanyiamino.

black.

reddishblack.

Tint

. 1-aminobenzene-2.5-disulionio acid --0 1 amino 4 chlorobenzene 2 sulfoni 1 aminobanzene 4 aulionic acid ----0 1 amino- I acid 8 hydroxynaphthalene 4.6 disulionic acid 4.4 diamino diphenyl --0 3.3 dihydroxydiphcnylamine. 1 amino 4 methylbcnzene 3 suiionic acid --o 1 amino; 8 hydroxynaphthalene 3.6 dlsulionic cl acid 0 4.4 -diamino-diphanyi -c 3.3- dihydroxy-diphenylamine.

. 1 aminobcnzena 3 aulionic acid -0 1 aminoacid 8 hydroxynaphthalcna 3.6 diauliouic acid 4-- 4.4 diamino diphenyl 3.3 dihydroxydipbcnylamtue.

4 amino 1.1 azobenzene 4 a onic acid 1 amino 1; 8 hydroxynaphthaiena 3.6 disultonlc acid 4.4 diamino diphenyl -r 3.3- dihydroxy-diphenylamine.

. 2 aminonaphthalene 5.7 disulicnic acid -0 1- amino 8 hydroxynaphthalene 3.6 disulionic acid acid 4.4 diamino diphenyl --o 3.3 dihydroxy diphcnyi amine.

. 1-amino-3-chiorobanzene-4-sulionic acid 1- amigo 8 hydroxynaphthalene 3.6 disulionic acid 4.4 diamino diphanyl -o 3.3 dihydroxy-diphenylamine.

. 1 amino 4 chiorobenzene 3 sultonic acid -v v1 aminoi 8 hydroxynaphthaiena 3.6 disulfonic acid t- 4.4 -diamino-diphenyl -o 3.3- dlhydroxy-dlphenylamine.

. chlorotoluidine sullonic acids -v 1 amtnoh-i8- hydroxynaphthalenc 3.6 disulfonic acid 4.4 diamtno diphcnyl ---v 3.3 dihydroxydiphenylamine.

, 1 aminonaphthalene 6 (7) sulionic acid (mixture of 'Cievca acids) 1 amino 8 hydroxyacid naphthalene 3.6 disuitonic acid v-- 4.4 diamino-diphenyl 3.3-dihydmxy-diphenylamine. 1 amino 2 methyl 3 chlorobenzenc 6 sultonic acid -0 1 amino 8 hydroxynaphthalcne 3.6 d sulacid ionic acid o- 4.4-diamino-diphenyl --o 3.3- dihydroxy diphenyiamine 1 amino 2 methyl 3 chlorobenzcne 6 sullonic acid.

. 1 amincnaphthalene 6 (7) sulionic acid (mixture of lene 3.6 disulionic acid 1-- 4.4- diamino diphcnyl --r 3.3-dihydroxy-d i p h e n y l a min e a-- 1-aminonaphthalene-6-(7)'sullonic acid (mixture of Cleves acids).

. 1 amino 4 methylbenzene 3 sulicnic acid -v 1 aminold- 8 hydroxynaphthaiene 3.6 disulionic acid 4.4- diaminodiphenyl 3.3-dihydroxy-diphenylamine i-amino-4-methyibenzene-ii-suiionic acid.

. i-aminobenzcnei-sulionic acid --0 i-amiiltiio-ti-hydroxyna hthalene-3.6-disulionic acid e- 4.4-diamino iphenyl 3.3'- dihydroxy diphanyiamine 1 aminobenzene 2 sulionic acid.

.1-aminobenzene-3-sulionic acid --v I-amjtgo-iihydroxynaphthalcne-3.6-disulionic acid 4.4- diamino diphenyl 3.3- dihydroxy diphenylamine 4-- l-aminobenzene-S-sulionic acid.

. l-aminobenzene-i-suitonic acid --r l-amiigo-ti hydroxynaphthalene 3.6 disulionie'acid 4- 4.4- aminc 3.3- dimcthyl dipheuyl -o 3 3- dillydroxy diphcuyiamine o 1 aminobenzeue -4 sulionic acid.

l-zamino-S- Bel hydroxynaphthalene-3.&disulionicacid 4- 4.4- dlaminodiphenyl -o 3.3- dthydroxy -diphenylamine 1-aminobenzene-2.5-disulfonic acid.

0 acid -v 1 aminoki 8 hydroxynaphthaleue 3.6 disulionic acid 4- 4.4' diamino-diphenyl --o 3.3- dihydroxy-diphenylaminc 4- 1 amino -4-chiorobenzenc-2-sulionic acid.

. 1 aminobenzene -4 sulionic acid -0 1 amino8- 1 amino 3 nltrobenzene 4 aulionic acid ---0 1 amino; 8 hydroxynaphthalene 3.6 disulionio acid 4.4-diamino diphenyl --o 3.3- dihydroxy-diphenylamine 1 amino 8. nitrobenzene-Halftime acid.

black.

imeniuh black black.

blueblack.

reddish black.

black.

Ieddllllblack.

bluiahblack.

black.

blueblack.

greenishblack.

black.

greenish.

black.

black.

blulahblack.

blue-black.

violet.

blue-black.

"We'cIaim: consisting of hydrogen and the sulfonic acid group, and 1; Polyazo-dyestufis corresponding to the following It stands for one of the numbers 1 and 2. general formula 2. Polyazo-dyestufis corresponding to the following OH NH,

' HO OH R N=N N=N N=N 0+0 O sonar n wherein R represents a member selected from the group general formula 0H NH,

H0 0H: RN=N N=N N=N wherein R represents a radical of the benzene series, Y stands for a member of the group consisting of hydrogen 3 and the sulfonic acid group, and n stands for one of the numbers 1 and 2.

3. The polyazo-dyestufi corresponding to the followconsisting of benzene, sulfobenzene, disulfobenzene, chloro-sulfobenzene, methyl-sulfobenzene, methyl-chlorosulfobenzene, nitrobenzene, nitro-sulfobenzene, acetaming formula 110,5 0H NH, 1

H0 on 0M3 H0 5 503E .v

ino-sulfobenzene, carboxylbenzene, phenylamino-nitro- 4. The polyazo-dyestufi corresponding to the followsulfobenzene, sulfophenylazobenzene, mono-sulfonaphing formula HO NH HO OH oH,0o-HN -N=N- N=N- C N=N 0 1 so H G O v 3 3 Hoss thalene and di-sulfonaphthalene, X stands for one of the 5. The polyazo-dyestufl corresponding to the followgroup consisting of vthe diphenyl bond, CH=CH-, ing formula HO NH, no on Hogs -s0,n 1

----NH-CONH, CO, O-, --S-, --NH- 6. The polyazo-dyestufi corresponding to the follow- J and CONH, Y stands for a member of the group ing formula HO NH,

H03 3 NH no NH, 5'

E 0 3S 1 P 13 14 7. The polyazo-dyestufi corresponding to the following formula OH NH:

References Cited in the file of this patent UNITED STATES PATENTS 2,777,838 Huss et a1 Ian. 15, 1957 

1. POLYAZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA 